JP3521853B2 - Manufacturing method of LP steel sheet - Google Patents
Manufacturing method of LP steel sheetInfo
- Publication number
- JP3521853B2 JP3521853B2 JP2000242906A JP2000242906A JP3521853B2 JP 3521853 B2 JP3521853 B2 JP 3521853B2 JP 2000242906 A JP2000242906 A JP 2000242906A JP 2000242906 A JP2000242906 A JP 2000242906A JP 3521853 B2 JP3521853 B2 JP 3521853B2
- Authority
- JP
- Japan
- Prior art keywords
- plate thickness
- plate
- rolled
- change region
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
Landscapes
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＬＰ鋼板の製造方
法に関する。TECHNICAL FIELD The present invention relates to a method for manufacturing an LP steel sheet.
【０００２】[0002]
【従来の技術】板長さ方向へ板厚が連続的に変化するＬ
Ｐ鋼板（Longitudinally Profiled Plate)は、板長さ方
向へ受ける応力分布に応じた断面形状を有する一般構造
用部材等として使用することが可能であるため、素材重
量の軽減や部材加工工数の削減等といった点で多大な効
果を奏する。2. Description of the Related Art L in which the plate thickness continuously changes in the plate length direction
The P steel plate (Longitudinally Profiled Plate) can be used as a general structural member having a cross-sectional shape according to the stress distribution received in the plate length direction, so that the material weight is reduced and the number of member processing steps is reduced. It has a great effect in that.
【０００３】かかるＬＰ鋼板は、単一の圧延素材からの
圧延により、または複数の部材同士の接合により製造さ
れるが、圧延による場合には、長手方向の厚みが略一定
である圧延素材に、可逆式圧延機を用いて圧延時のロー
ルギャップを適宜変更しながら複数パスのリバース圧延
を行うことによって、製造される。しかし、このリバー
ス圧延時の各パスにおけるロールギャップを最適に設定
することによって所望の板厚差を正確に付与されたＬＰ
鋼板を製造することは、容易ではない。このため、これ
までにも、特に圧延により製造されるＬＰ鋼板の寸法精
度を向上させるための発明が多数提案されてきた。Such an LP steel plate is manufactured by rolling from a single rolling material or by joining a plurality of members to each other. In the case of rolling, a rolling material having a substantially constant thickness in the longitudinal direction is used. It is manufactured by performing a multi-pass reverse rolling while appropriately changing the roll gap during rolling using a reversible rolling mill. However, by setting the roll gap in each pass at the time of this reverse rolling to be optimum, the LP having a desired plate thickness difference can be accurately given.
Manufacturing steel sheets is not easy. Therefore, many inventions have been proposed so far, particularly for improving the dimensional accuracy of LP steel sheets manufactured by rolling.
【０００４】例えば特開平７−１８５６０４号公報に
は、長手方向の全長にわたって板厚がテーパ状に変化す
る所定の板厚変化領域を有するように圧延を行われた被
圧延材について、その長手方向への板厚プロフィルを測
定し、この測定結果に基づいて、被圧延材の板厚が最終
製品であるＬＰ鋼板の先端部および後端部それぞれの板
厚の許容範囲内となる長手方向の２箇所の位置で、被圧
延材を切断することによって、先端部および後端部それ
ぞれの板厚不良の発生が防止されたＬＰ鋼板を製造する
発明が開示されている。For example, Japanese Patent Laid-Open No. 7-185604 discloses a material to be rolled which is rolled so as to have a predetermined plate thickness change region in which the plate thickness changes in a taper shape over the entire length in the longitudinal direction. To the longitudinal direction where the thickness of the material to be rolled falls within the allowable range of the thickness of each of the leading edge portion and the trailing edge portion of the LP steel sheet as the final product based on the measurement result. Disclosed is an invention for manufacturing an LP steel plate in which the occurrence of a defective plate thickness at each of the leading end portion and the trailing end portion is prevented by cutting the material to be rolled at a certain position.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、この特
開平７−１８５６０４号公報により開示された発明は、
その特許請求の範囲に「長手方向にその一端から他端に
向かって漸次厚みの異なるテーパプレートを圧延するに
際し」と記載されていることからも理解されるように、
長手方向へ板厚がテーパ状に変化する板厚変化領域だけ
ではなく、長手方向へ板厚が変化しない平坦部をも有す
るＬＰ鋼板に対しては、適用することができない。However, the invention disclosed in Japanese Patent Application Laid-Open No. 7-185604 has the following problems.
As can be understood from the scope of the claims, "when rolling a taper plate having different thicknesses gradually from one end to the other end in the longitudinal direction",
It cannot be applied to the LP steel plate having not only the plate thickness changing region where the plate thickness changes in the longitudinal direction but also the flat portion where the plate thickness does not change in the longitudinal direction.
【０００６】また、ＬＰ鋼板の圧延の際には、例えば、
圧延時における先進率の予測誤差や被圧延材の測長誤差
等によって板厚変化領域の長さに誤差を生じたり、被圧
延材の先端部や後端部の板厚制御のバラツキによって被
圧延材の板厚精度（実績板厚−目標板厚）が低下してし
まうことがあり、このような場合には所定の寸法の板厚
変化領域を形成できない。被圧延材に所定の寸法の板厚
変化領域を形成できないと、例えば先端部の切断位置に
おける板厚を目標板厚に一致させても、後端部の切断位
置では板厚変化領域の誤差分だけ板厚が変動し、この誤
差の大きさによっては板厚公差を外れてしまい、寸法不
良となるおそれがあった。When rolling the LP steel sheet, for example,
There is an error in the length of the strip thickness change region due to an error in the prediction of the advanced rate during rolling or an error in measuring the length of the material to be rolled, and there is variation in the thickness control of the leading and trailing edges of the material to be rolled. The plate thickness accuracy (actual plate thickness-target plate thickness) of the material may decrease, and in such a case, the plate thickness change region having a predetermined dimension cannot be formed. If it is not possible to form a plate thickness change region of a predetermined size on the material to be rolled, for example, even if the plate thickness at the cutting position at the leading end matches the target plate thickness, the error in the plate thickness changing region at the cutting position at the rear end is The plate thickness fluctuates only, and depending on the magnitude of this error, the plate thickness tolerance may be exceeded, which may result in dimensional defects.
【０００７】本発明の目的は、平坦部の有無に関係なく
適用することができるとともに、圧延工程での板厚およ
び板厚変化領域等の寸法精度の誤差の影響を最小限に抑
制することができ、板厚変化領域を有する被圧延材か
ら、良好な寸法精度でＬＰ鋼板を確実に切り出して製造
することが可能なＬＰ鋼板の製造方法を提供することで
ある。The object of the present invention can be applied regardless of the presence or absence of a flat portion, and can minimize the influence of dimensional accuracy errors such as plate thickness and plate thickness change region in the rolling process. An object of the present invention is to provide a method for producing an LP steel sheet, which can be produced by reliably cutting out an LP steel sheet with good dimensional accuracy from a material to be rolled having a plate thickness change region.
【０００８】[0008]
【課題を解決するための手段】本発明は、板長さ方向に
ついて板厚がテーパ状に変化する板厚変化領域を有する
ように圧延を行われた被圧延材を切断することによっ
て、板長さ方向について板厚がテーパ状に変化する板厚
変化領域を一つ有するＬＰ鋼板を製造する際に、被圧延
材が切断される位置が、この被圧延材の板厚変化領域に
おける板厚実測値の最大値および最小値の平均値、また
は、ＬＰ鋼板の板厚変化領域における板厚目標値の最大
値および最小値の平均値と略同じ値の板厚を有する位置
を基準位置として、決定されることを特徴とするＬＰ鋼
板の製造方法である。DISCLOSURE OF THE INVENTION According to the present invention, a plate length is obtained by cutting a material to be rolled that has a plate thickness change region in which the plate thickness changes in a taper shape in the plate length direction. When manufacturing an LP steel plate having one plate thickness change region where the plate thickness changes in the taper direction in the depth direction, the position where the rolled material is cut is the plate thickness measurement in the plate thickness change region of this rolled material. The maximum value and the average value of the minimum values, or the position having a plate thickness that is substantially the same as the average value of the maximum value and the minimum value of the plate thickness target values in the plate thickness change region of the LP steel plate is determined as the reference position. And a method for manufacturing an LP steel sheet.
【０００９】この本発明にかかるＬＰ鋼板の製造方法で
は、被圧延材が切断される位置のうちの一方の位置が、
基準位置から、ＬＰ鋼板における板厚変化領域の板長さ
方向への目標長さの半分と、このＬＰ鋼板の一方の位置
の側における板厚変化領域以外の領域の板長さ方向への
目標長さとを加算した距離だけ、離れた位置として、決
定されることが、例示される。In the method for manufacturing an LP steel sheet according to the present invention, one of the positions where the material to be rolled is cut is
Half the target length in the plate length direction of the plate thickness change region of the LP steel plate from the reference position, and the target in the plate length direction of the region other than the plate thickness change region on one side of this LP steel plate. It is exemplified that the position is determined as the position separated by the distance obtained by adding the length.
【００１０】また、この場合、被圧延材が切断される位
置のうちの他方の位置が、決定された一方の位置から、
ＬＰ鋼板の板長さ方向への目標長さと同じ距離だけ、離
れた位置として、決定されることが、例示される。Further, in this case, the other position of the positions where the material to be rolled is cut is determined from the determined one position.
It is exemplified that the position is determined as a position separated by the same distance as the target length of the LP steel plate in the plate length direction.
【００１１】[0011]
【発明の実施の形態】（第１の実施の形態）以下、本発
明にかかるＬＰ鋼板の製造方法の実施の形態を、添付図
面を参照しながら詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) Hereinafter, an embodiment of a method for manufacturing an LP steel sheet according to the present invention will be described in detail with reference to the accompanying drawings.
【００１２】図１は、本実施の形態のＬＰ鋼板の製造方
法の説明図である。本実施形態では、以下の工程(i) 〜
工程(iii) にしたがってＬＰ鋼板が製造される。以下、
図１を参照しながらこれらの工程(i) 〜工程(iii) につ
いて詳細に説明する。FIG. 1 is an explanatory view of a method for manufacturing an LP steel sheet according to this embodiment. In this embodiment, the following steps (i) ~
An LP steel plate is manufactured according to the step (iii). Less than,
These steps (i) to (iii) will be described in detail with reference to FIG.
【００１３】(i) 被圧延材１の製造
本実施形態では、長手方向の厚みが略一定である圧延素
材に、可逆式圧延機を用いて圧延時のロールギャップを
適宜変更しながら複数パスのリバース圧延を行うことに
よって、図１に示す被圧延材１が製造される。(I) Manufacture of material 1 to be rolled In the present embodiment, a rolling material having a substantially constant thickness in the longitudinal direction is subjected to a plurality of passes while appropriately changing the roll gap during rolling using a reversible rolling mill. By performing reverse rolling, the material 1 to be rolled shown in FIG. 1 is manufactured.
【００１４】これら複数パスのリバース圧延によって、
被圧延材１は、板長さ方向（図１における左右方向）に
ついて板厚がテーパ状に変化する板厚変化領域２を有す
るように製造される。By the reverse rolling of these multiple passes,
The material 1 to be rolled is manufactured so as to have a plate thickness change region 2 in which the plate thickness changes in a taper shape in the plate length direction (the horizontal direction in FIG. 1).
【００１５】また、これら複数パスのリバース圧延によ
って、被圧延材１は、この板厚変化領域２の板長さ方向
の両端側に、板厚が一定である平坦部３ａ、３ｂを有す
るように製造される。なお、図１に示す本実施形態で
は、板厚変化領域２の板厚の実測値の最大値、すなわち
平坦部３ａの板厚の実測値はＴ1 であり、一方、板厚変
化領域２の板厚の実測値の最小値、すなわち平坦部３ｂ
の板厚の実測値はＴ2 である。Further, by these multiple passes of reverse rolling, the material 1 to be rolled has flat portions 3a, 3b having a constant plate thickness on both ends of the plate thickness change region 2 in the plate length direction. Manufactured. In the present embodiment shown in FIG. 1, the maximum value of the measured values of the plate thickness of the plate thickness change region 2, that is, the measured value of the plate thickness of the flat portion 3a is T 1 , while the value of the plate thickness change region 2 of the plate thickness change region 2 is The minimum value of the measured thickness, that is, the flat portion 3b
The actual measured value of the plate thickness is T 2 .
【００１６】この被圧延材１の製造の際に使用される圧
延素材や可逆式圧延機、さらにはロールギャップの変更
手段や複数パスのリバース圧延の手法等については、い
ずれも、周知慣用のものを用いればよいため、本明細書
ではこれらに関する説明は省略する。The rolling material and the reversible rolling mill used in the production of the material 1 to be rolled, the means for changing the roll gap, the method of reverse rolling of a plurality of passes, and the like are all well known and commonly used. Therefore, description regarding these is omitted in this specification.
【００１７】なお、この図１には、製品であるＬＰ鋼板
１１の目標値も併記する。ＬＰ鋼板１１も、板長さ方向
について板厚がテーパ状に変化する板厚変化領域１２を
有するとともに、板厚変化領域１２の板長さ方向の両端
側に、板厚が一定である平坦部１３ａ、１３ｂを有す
る。なお、図１に示す本実施形態では、板厚変化領域１
２の板厚の目標値の最大値、すなわち平坦部１３ａの板
厚の目標値はａであり、板厚変化領域１２の板厚の目標
値の最小値、すなわち平坦部１３ｂの板厚の目標値はｂ
である。Note that FIG. 1 also shows target values of the LP steel plate 11 as a product. The LP steel plate 11 also has a plate thickness change region 12 in which the plate thickness changes in a taper shape in the plate length direction, and a flat portion having a constant plate thickness on both end sides of the plate thickness change region 12 in the plate length direction. It has 13a and 13b. In the present embodiment shown in FIG. 1, the plate thickness change region 1
2 is the maximum value of the target value of the plate thickness, that is, the target value of the plate thickness of the flat portion 13a is a, and the minimum value of the target value of the plate thickness of the plate thickness change region 12, that is, the target of the plate thickness of the flat portion 13b. Value is b
Is.
【００１８】図１に示すように、例えば、圧延時におけ
る先進率の予測誤差や被圧延材の測長誤差等によって板
厚変化領域２の長さに誤差を生じたり、被圧延材１の先
端部や後端部の板厚制御のバラツキによって、被圧延材
１の各部寸法の実測値は、ＬＰ鋼板１１の各部寸法の目
標値に一致しないことが多い。As shown in FIG. 1, for example, an error occurs in the length of the strip thickness change region 2 due to a prediction error of the advance rate during rolling, a length measurement error of the rolled material, or the tip of the rolled material 1. Due to variations in the plate thickness control of the parts and the rear end, the measured values of the respective dimensions of the material 1 to be rolled often do not match the target values of the respective dimensions of the LP steel plate 11.
【００１９】本実施形態では、被圧延材１は、このよう
にして製造される。
(ii)被圧延材１の切断位置の決定
次に、工程(i) により製造された被圧延材１を、その板
長さ方向の２箇所で切断する切断位置Ｐ1 、Ｐ2 を決定
する。In the present embodiment, the material 1 to be rolled is manufactured in this manner. (ii) Determination of Cutting Position of Rolled Material 1 Next, cutting positions P 1 and P 2 for cutting the rolled material 1 manufactured by the step (i) at two positions in the plate length direction are determined. .
【００２０】初めに、テーパ中央部目標板厚ＴM を算出
する。このテーパ中央部目標板厚Ｔ M は、製造目標であ
るＬＰ鋼板１１の板厚の最大目標値ａと最小目標値ｂと
の平均値（ａ＋ｂ）／２、若しくは、圧延された被圧延
材１の板厚変化領域２における最大実測値Ｔ1 と最小実
測値Ｔ2 との平均値（Ｔ1 ＋Ｔ2 ）／２である。すなわ
ち、本実施形態におけるＬＰ鋼板１１若しくは被圧延材
１は、板長さ方向について板厚がテーパ状に変化する板
厚変化領域１２、２を一つ有するが、テーパ中央部目標
板厚ＴM は、板厚変化領域における目標値の最大値ａお
よび最小値ｂの平均値（ａ＋ｂ）／２、若しくは実測値
の最大値Ｔ1 および最小値Ｔ2 の平均値（Ｔ1 ＋Ｔ2 ）
／２である。First, the target plate thickness T at the center of the taperMCalculate
To do. This target thickness T of the central portion of the taper MIs the manufacturing goal
The maximum target value a and the minimum target value b of the LP steel plate 11
Average value (a + b) / 2 or rolled object
Maximum measured value T in plate thickness change region 2 of material 11And the smallest real
Measured value T2And the average value (T1+ T2) / 2. Sanawa
Then, the LP steel plate 11 or the material to be rolled in the present embodiment
1 is a plate whose plate thickness changes in a taper shape in the plate length direction.
It has one thickness change region 12 and 2 but the taper center part target
Plate thickness TMIs the maximum value a or the target value in the thickness change region.
And the average value (a + b) / 2 of the minimum value b, or the measured value
Maximum value T of1And the minimum value T2Average of (T1+ T2)
/ 2.
【００２１】表１には、テーパ中央部目標板厚ＴM を算
出する際に、板厚変化領域２における目標値の最大値ａ
および最小値ｂの平均値（ａ＋ｂ）／２を用いるのか、
または実測値の最大値Ｔ1 および最小値Ｔ2 の平均値
（Ｔ1 ＋Ｔ2 ）／２を用いるのかについての判断基準を
示す。Table 1 shows the maximum value a of the target value in the plate thickness change region 2 when calculating the taper center target plate thickness T M.
And using the average value (a + b) / 2 of the minimum value b,
Alternatively, a criterion for deciding whether to use the average value (T 1 + T 2 ) / 2 of the maximum value T 1 and the minimum value T 2 of the measured values is shown.
【００２２】[0022]
【表１】
表１に示すように、Ｔ1 ＜ａかつＴ2 ＜ｂである場合に
は実測値の最大値Ｔ1および最小値Ｔ2 の平均値（Ｔ1
＋Ｔ2 ）／２を用い、これ以外の場合、すなわち、Ｔ
1 ＜ａかつＴ2 ≧ｂ、Ｔ1 ≧ａかつＴ2 ＜ｂ、Ｔ1
≧ａかつＴ2 ≧ｂである場合には、板厚変化領域１２に
おける目標値の最大値ａおよび最小値ｂの平均値（ａ＋
ｂ）／２を用いることが、望ましい。すなわち、切断さ
れて製造されるＬＰ鋼板の寸法精度を高めるためには、
目標値の最大値ａおよび最小値ｂの平均値（ａ＋ｂ）／
２を用いることが望ましいが、Ｔ1 ＜ａかつＴ2 ＜ｂで
ある場合には、目標値であるａ、ｂに対して実測値
Ｔ1 、Ｔ2 が小さ過ぎるため、得られるＬＰ鋼板の板厚
が小さくなり過ぎるからである。[Table 1] As shown in Table 1, when T 1 <a and T 2 <b, the average value of the maximum value T 1 and the minimum value T 2 (T 1
+ T 2 ) / 2, otherwise, ie, T
1 <a and T 2 ≧ b, T 1 ≧ a and T 2 <b, T 1
When ≧ a and T 2 ≧ b, the average value (a +) of the maximum value a and the minimum value b of the target value in the plate thickness change region 12
It is desirable to use b) / 2. That is, in order to improve the dimensional accuracy of the LP steel plate that is cut and manufactured,
Average value (a + b) of maximum value a and minimum value b of target value /
Although it is desirable to use 2, when T 1 <a and T 2 <b, the measured values T 1 and T 2 are too small with respect to the target values a and b. This is because the plate thickness becomes too small.
【００２３】図１に示す本実施の形態は、Ｔ1 ≧ａかつ
Ｔ2 ＜ｂの場合であるので、この表１に示す基準にした
がって、テーパ中央部目標板厚ＴM ＝（ａ＋ｂ）／２を
用いる。In the present embodiment shown in FIG. 1, since T 1 ≧ a and T 2 <b, the taper center target plate thickness T M = (a + b) / 2 is used.
【００２４】次に、このようにして決定されたテーパ中
央部目標板厚ＴM ＝（ａ＋ｂ）／２に対して、被圧延材
１の板厚変化領域２において同じ板厚となる位置を、テ
ーパ中央部板厚点（以下、「基準位置」という）Ｐ0 と
して決定し、この基準位置Ｐ 0 を製品切断時の基準点と
する。すなわち、基準位置Ｐ0 は、被圧延材１の板厚変
化領域２のうちの板厚実測値の最大値Ｔ1 および最小値
Ｔ2 の平均値（Ｔ1 ＋Ｔ2 ）／２、若しくはＬＰ鋼板１
１の板厚変化領域１２のうちの板厚目標値の最大値ａお
よび最小値ｂの平均値（ａ＋ｂ）／２と略同じ値の板厚
を有する位置として、決定される。Next, in the taper thus determined
Center part target thickness TM= (A + b) / 2, rolled material
The position where the plate thickness is the same in the plate thickness change region 2 of 1 is
Center plate thickness point (hereinafter referred to as "reference position") P0When
And determine this reference position P 0As the reference point when cutting the product
To do. That is, the reference position P0Is the plate thickness change of the rolled material 1.
Maximum value T of the actual measured value of the plate thickness in the conversion region 21And the minimum value
T2Average of (T1+ T2) / 2, or LP steel plate 1
The maximum value a of the plate thickness target value in the plate thickness change region 12
And the plate thickness of approximately the same value as the average value (a + b) / 2 of the minimum value b
Is determined as the position having.
【００２５】次に、被圧延材１が切断される位置のうち
の一方の切断位置Ｐ1 が、基準位置Ｐ0 から、ＬＰ鋼板
１１における板厚変化領域１２の板長さ方向への目標長
さＬ 2 の半分（Ｌ2 ／２）と、このＬＰ鋼板１１の一方
の切断位置Ｐ1 の側における板厚変化領域以外の領域１
３ａの板長さ方向への目標長さＬ1 とを加算した距離
｛（Ｌ2 ／２）＋Ｌ1 ｝だけ、離れた位置として、決定
される。Next, of the positions where the rolled material 1 is cut,
One cutting position P1Is the reference position P0From, LP steel plate
Target length of plate thickness change region 12 in plate length direction 11
L 2Half of (L2/ 2) and one of the LP steel plates 11
Cutting position P1Area 1 other than the thickness change area on the side of
Target length L of 3a in the plate length direction1Distance added
{(L2/ 2) + L1}, Determined as a distant position
To be done.
【００２６】すなわち、基準位置Ｐ0 から先端側に、板
厚変化領域１２の長さＬ2 の半分の距離（Ｌ2 ／２）
と、ＬＰ鋼板１１の平坦部１３ａの長さＬ1 とを合計し
た距離｛（Ｌ2 ／２）＋Ｌ1 ｝だけ離れた位置を、先端
側の切断位置Ｐ1 として決定する。[0026] That is, the distal end side from the reference position P 0, the length half the distance L 2 of the plate thickness changing region 12 (L 2/2)
When the distance which is the sum of the length L 1 of the flat portion 13a of the LP plates 11 {(L 2/2) + L 1} to a position apart, determined as the cut position P 1 of the tip side.
【００２７】そして、被圧延材１が切断される位置のう
ちの他方の位置Ｐ2 は、決定された一方の切断位置Ｐ1
から、ＬＰ鋼板１１の板長さ方向への目標長さＬと同じ
距離だけ離れた位置として、決定される。すなわち、先
端側の切断位置Ｐ1 から後端側へ、ＬＰ鋼板１１の予定
製品長さＬだけ離れた位置を後端側の切断位置Ｐ2 とし
て決定する。The other position P 2 of the positions where the rolled material 1 is cut is the determined one cutting position P 1
Is determined as a position separated by the same distance as the target length L of the LP steel plate 11 in the plate length direction. That is, a position distant from the cutting position P 1 on the front end side to the rear end side by the planned product length L of the LP steel plate 11 is determined as the cutting position P 2 on the rear end side.
【００２８】本実施形態では、このようにして、先端側
の切断位置Ｐ1 および後端側の切断位置Ｐ2 をともに決
定することによって、被圧延材１から、寸法精度が目標
とするＬＰ鋼板１１に近く良好な形状を有するＬＰ鋼板
を容易に切り出すことができる。In the present embodiment, by determining both the cutting position P 1 on the leading end side and the cutting position P 2 on the trailing end side in this way, the LP steel sheet whose dimensional accuracy is targeted from the rolled material 1 is determined. It is possible to easily cut out an LP steel plate having a good shape close to 11.
【００２９】なお、本実施形態では、先端側の切断位置
Ｐ1 を後端側の切断位置Ｐ2 よりも先に決定したが、被
圧延材１の状態および切断工程時における作業状態等に
応じて、後端側の切断位置Ｐ2 を先端側の切断位置Ｐ1
よりも先に決定するようにしてもよい。In this embodiment, the cutting position P 1 on the leading end side is determined before the cutting position P 2 on the trailing end side. However, depending on the condition of the material to be rolled 1 and the working condition during the cutting process, etc. The cutting position P 2 on the rear end side to the cutting position P 1 on the front end side.
It may be decided before.
【００３０】また、本実施形態では、切断時に付与する
余長を後端側の平坦部３ｂに付与して吸収することとし
た。しかし、切断時に付与する余長についても、被圧延
材１の状態および切断工程時における作業状態、さらに
は客先からの要望等によって、先端側に付与して吸収し
たり、先端側および後端側の両方均等に分割して付与し
て吸収するようにしてもよい。Further, in this embodiment, the extra length given at the time of cutting is given to the flat portion 3b on the rear end side to be absorbed. However, the extra length to be given at the time of cutting is also given to the tip side to be absorbed or to be given to the tip side and the back end depending on the state of the material to be rolled 1, the working state at the time of the cutting process, the request from the customer, and the like. Both sides may be equally divided and applied so as to be absorbed.
【００３１】さらに、平坦部１３ａの長さＬ1 を０とす
るとともに平坦部１３ｂの長さＬ3を０と設定すること
により、本実施形態は、平坦部を有さず、板厚変化領域
だけを有するＬＰ鋼板をも適用対象とすることができ
る。Further, by setting the length L 1 of the flat portion 13a to 0 and the length L 3 of the flat portion 13b to 0, the present embodiment does not have the flat portion and the plate thickness change region is provided. The LP steel plate having only the can be applied.
【００３２】このように、本実施形態では、被圧延材１
の切断位置Ｐ1 、Ｐ2 は、被圧延材１の板厚変化領域２
のうちの板厚実測値の最大値Ｔ1 および最小値Ｔ2 の平
均値（Ｔ1 ＋Ｔ2 ）／２、若しくはＬＰ鋼板１１の板厚
変化領域１２のうちの板厚目標値の最大値ａおよび最小
値ｂの平均値（ａ＋ｂ）／２と略同じ値の板厚を有する
位置として決定される基準位置Ｐ0 に基づいて、決定さ
れる。As described above, in this embodiment, the rolled material 1 is
The cutting positions P 1 and P 2 of the plate are the plate thickness change region 2 of the rolled material 1.
Average value (T 1 + T 2 ) / 2 of the maximum value T 1 and the minimum value T 2 of the plate thickness actually measured value, or the maximum value a of the plate thickness target value in the plate thickness change region 12 of the LP steel plate 11. And a reference position P 0 determined as a position having a plate thickness that is substantially the same as the average value (a + b) / 2 of the minimum value b.
【００３３】(iii) ＬＰ鋼板１１の製造
本実施形態では、このようにして決定された切断位置Ｐ
1 、Ｐ2 に基づいて、被圧延材１の切断が行われる。(Iii) Manufacturing of LP Steel Plate 11 In the present embodiment, the cutting position P determined in this way
The material to be rolled 1 is cut based on 1 and P 2 .
【００３４】切断手段は、周知慣用の手段によればよ
く、特定の手段には限定されない。このように、本実施
形態によれば、平坦部３ａ、３ｂの有無に関係なく適用
することができるとともに、圧延工程での板厚および板
厚変化領域２等の寸法精度誤差の影響を最小限に抑制す
ることができ、被圧延材１から寸法精度が良好なＬＰ鋼
板１１を容易に切断して製造することができる。The cutting means may be any known means and is not limited to a particular means. As described above, according to the present embodiment, it can be applied regardless of the presence or absence of the flat portions 3a and 3b, and the influence of the dimensional accuracy error such as the plate thickness and the plate thickness change region 2 in the rolling process can be minimized. Therefore, the LP steel plate 11 having good dimensional accuracy can be easily cut and manufactured from the material 1 to be rolled.
【００３５】[0035]
【実施例】さらに、本発明を実施例を参照しながら、よ
り具体的に説明する。板厚変化領域だけを有し、平坦部
を有さないＬＰ鋼板の製造の際に、本発明を適用した。EXAMPLES The present invention will be described more specifically with reference to examples. The present invention was applied to the production of an LP steel plate having only the plate thickness change region and having no flat portion.
【００３６】まず、厚肉厚である先端部板厚ａが４０．
００ｍｍ、薄肉厚である後端部板厚ｂが１５．００ｍｍ
であって製品全長Ｌが１５０００ｍｍ、製品幅が２５０
０ｍｍ、厚さ公差が各部の所定厚に対して下限値−０．
３０ｍｍ、上限値＋０．９５ｍｍであるＬＰ鋼板１１
を、被圧延材１から切断して採取するに際し、圧延工程
において誤差の累積によりテーパ部長さに＋２％の誤差
が発生し、被圧延材１のテーパ部長さが１５３００ｍｍ
となった。このとき、本発明を適用して被圧延材１の切
断を行った結果を、図２（ａ）に示す。First, the tip end plate thickness a, which is thick, is 40.
00mm, the thin plate thickness b of the rear end is 15.00mm
And the total product length L is 15000 mm and the product width is 250
0 mm, the thickness tolerance is the lower limit value −0.
LP steel plate 11 having a size of 30 mm and an upper limit value of +0.95 mm
When cutting and collecting from the rolled material 1, an error of + 2% occurs in the taper portion length due to the accumulated error in the rolling process, and the taper portion length of the rolled material 1 is 15300 mm.
Became. At this time, the result of applying the present invention and cutting the material 1 to be rolled is shown in FIG.
【００３７】また、先端部板厚ａが５０．００ｍｍ、薄
肉厚である後端部板厚ｂが２０．００ｍｍで製品全長Ｌ
が１００００ｍｍ、製品幅が２０００ｍｍ、厚さ公差が
各部の所定厚に対して下限値−０．８０ｍｍ、上限値＋
０．８０ｍｍのＬＰ鋼板を採取するにあたり、被圧延材
板内での先端部および後端部における板厚制御のバラツ
キにて、先端側実績板厚が５０．４０ｍｍ、後端側板厚
が１９．８０ｍｍとなった。このとき、本発明を適用し
て被圧延材１の切断を行った結果を、図３（ａ）に示
す。また、比較例として、従来法による実績先端部板厚
Ｔ1 が製品先端部板厚ａとなる点を基準としてＬＰ鋼板
を採取した場合の結果を図２（ｂ）、図３（ｂ）にそれ
ぞれ示す。なお、本発明例および比較例ともに、製品長
さに付与する余長は、製品長さの０．５％とした。Further, the front end plate thickness a is 50.00 mm, the thin rear end plate thickness b is 20.00 mm, and the total length L of the product is L.
Is 10000 mm, the product width is 2000 mm, and the thickness tolerance is a lower limit value −0.80 mm and an upper limit value + for the predetermined thickness of each part.
When collecting 0.80 mm LP steel plate, due to variations in plate thickness control at the front end and the rear end within the rolled material plate, the front end side actual plate thickness was 50.40 mm and the rear end side plate thickness was 19. It became 80 mm. At this time, the result of applying the present invention and cutting the material 1 to be rolled is shown in FIG. In addition, as a comparative example, FIG. 2B and FIG. 3B show the results when LP steel plates were sampled with reference to the point where the actual tip plate thickness T 1 obtained by the conventional method becomes the product tip plate thickness a. Shown respectively. In each of the present invention example and the comparative example, the extra length added to the product length was 0.5% of the product length.
【００３８】結果を表２にまとめて示す。The results are summarized in Table 2.
【００３９】[0039]
【表２】
この表２から明らかなように、本発明法は、先端部およ
び後端部双方の実績板厚精度や製品実績重量の精度のい
ずれの点でも優れており、圧延寸法精度の誤差の影響を
最小限に抑制しながら、寸法不合格率の低減および重量
精度の改善に極めて有効である。[Table 2] As is clear from Table 2, the method of the present invention is excellent in both the accuracy of the actual plate thickness and the accuracy of the actual product weight of both the front end portion and the rear end portion, and the influence of the error in the rolling dimension accuracy is minimized. It is extremely effective in reducing the dimension rejection rate and improving the weight accuracy while suppressing it to the limit.
【００４０】[0040]
【発明の効果】以上詳細に説明したように、本発明によ
れば、被圧延材のテーパ部中央板厚点を基準として二つ
の切断位置をともに決定するようにしたため、製品の形
状にかかわらず、被圧延材の圧延寸法精度誤差の影響を
最小限に抑制して、寸法精度の良好なＬＰ鋼板を容易に
製造することができ、ＬＰ鋼板の寸法不良の発生を効果
的に防止することができる。As described above in detail, according to the present invention, the two cutting positions are both determined with reference to the central plate thickness point of the taper portion of the material to be rolled, and therefore regardless of the shape of the product. The LP steel sheet with good dimensional accuracy can be easily manufactured by minimizing the influence of the rolling dimensional accuracy error of the material to be rolled, and the occurrence of dimensional defects of the LP steel sheet can be effectively prevented. it can.
【００４１】かかる効果を有する本発明の意義は、極め
て著しい。The significance of the present invention having such effects is extremely remarkable.
【図１】実施の形態のＬＰ鋼板の製造方法の説明図であ
る。FIG. 1 is an explanatory diagram of a method for manufacturing an LP steel sheet according to an embodiment.
【図２】図２（ａ）は、実施例において本発明を適用し
て被圧延材の切断を行った状況を示す説明図であり、図
２（ｂ）は、実施例において従来法を適用して被圧延材
の切断を行った状況を示す説明図である。FIG. 2 (a) is an explanatory view showing a situation in which a rolled material is cut by applying the present invention in an embodiment, and FIG. 2 (b) applies a conventional method in the embodiment. It is explanatory drawing which shows the condition which cut | disconnected the material to be rolled.
【図３】図３（ａ）は、実施例において本発明を適用し
て被圧延材の切断を行った状況を示す説明図であり、図
３（ｂ）は、実施例において従来法を適用して被圧延材
の切断を行った状況を示す説明図である。FIG. 3 (a) is an explanatory view showing a situation in which a rolled material is cut by applying the present invention in an embodiment, and FIG. 3 (b) shows a conventional method applied in an embodiment. It is explanatory drawing which shows the condition which cut | disconnected the material to be rolled.
１ 被圧延材 ２ 板厚変化領域 １１ ＬＰ鋼板 １２ 板厚変化領域 ａ，ｂ 板厚目標値 Ｐ0 基準位置 Ｐ1 、Ｐ2 切断位置1 rolled material 2 plate thickness change region 11 LP steel plate 12 plate thickness change region a, b plate thickness target value P 0 reference position P 1 , P 2 cutting position
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B21B 1/00 - 1/46 B21B 37/00 - 37/78 ─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. 7 , DB name) B21B 1/00-1/46 B21B 37/00-37/78
Claims (3)
化する板厚変化領域を有するように圧延を行われた被圧
延材を切断することによって、板長さ方向について板厚
がテーパ状に変化する板厚変化領域を一つ有するＬＰ鋼
板を製造する際に、 前記被圧延材が切断される位置は、該被圧延材の前記板
厚変化領域における板厚実測値の最大値および最小値の
平均値、または、前記ＬＰ鋼板の前記板厚変化領域にお
ける板厚目標値の最大値および最小値の平均値と略同じ
値の板厚を有する位置を基準位置として、決定されるこ
とを特徴とするＬＰ鋼板の製造方法。1. A plate thickness is tapered in the plate length direction by cutting a material to be rolled that is rolled so as to have a plate thickness change region in which the plate thickness changes in a tape shape in the plate length direction. When manufacturing an LP steel sheet having one plate thickness change region that changes to, the position where the rolled material is cut is the maximum and minimum of the measured plate thickness values in the plate thickness change region of the rolled material. The average value of the values, or a position having a plate thickness of substantially the same value as the average value of the maximum value and the minimum value of the plate thickness target value in the plate thickness change region of the LP steel plate is determined as the reference position. A method for producing a characteristic LP steel plate.
一方の位置は、前記基準位置から、前記ＬＰ鋼板におけ
る前記板厚変化領域の前記板長さ方向への目標長さの半
分と、該ＬＰ鋼板の前記一方の位置の側における前記板
厚変化領域以外の領域の前記板長さ方向への目標長さと
を加算した距離だけ、離れた位置として、決定される請
求項１に記載されたＬＰ鋼板の製造方法。2. One of the positions where the material to be rolled is cut is a half of a target length in the plate length direction of the plate thickness change region of the LP steel plate from the reference position. The position is determined as a position separated by a distance obtained by adding a target length in the plate length direction of a region other than the plate thickness change region on the one position side of the LP steel plate. For manufacturing the manufactured LP steel sheet.
他方の位置は、決定された前記一方の位置から、前記Ｌ
Ｐ鋼板の前記板長さ方向への目標長さと同じ距離だけ、
離れた位置として、決定される請求項２に記載されたＬ
Ｐ鋼板の製造方法。3. The other position of the positions where the material to be rolled is cut is the L position from the determined one position.
The same distance as the target length of the P steel plate in the plate length direction,
The L according to claim 2, which is determined as a remote position.
Method for manufacturing P steel sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000242906A JP3521853B2 (en) | 2000-08-10 | 2000-08-10 | Manufacturing method of LP steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000242906A JP3521853B2 (en) | 2000-08-10 | 2000-08-10 | Manufacturing method of LP steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002059202A JP2002059202A (en) | 2002-02-26 |
| JP3521853B2 true JP3521853B2 (en) | 2004-04-26 |
Family
ID=18733847
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000242906A Expired - Fee Related JP3521853B2 (en) | 2000-08-10 | 2000-08-10 | Manufacturing method of LP steel sheet |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101780637B (en) * | 2010-01-14 | 2012-10-24 | 重庆大学 | Method for producing large longitudinal variable cross-section steel plates |
| CN110653561A (en) * | 2018-06-28 | 2020-01-07 | 宝山钢铁股份有限公司 | Transverse and longitudinal bidirectional variable-thickness steel plate and preparation method thereof |
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|---|---|---|---|---|
| JP5420445B2 (en) * | 2010-02-23 | 2014-02-19 | 新日鐵住金株式会社 | Method of searching for gradient change point of tapered steel plate and method of manufacturing tapered steel plate |
| CN107052059B (en) * | 2017-06-16 | 2019-12-06 | 安徽工程大学 | rolling control method based on general five-section type mark of LP steel plate target size |
| CN110657342B (en) * | 2018-06-28 | 2022-09-20 | 宝山钢铁股份有限公司 | Transverse thickness-variable wide common carbon-manganese steel plate and preparation method thereof |
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2000
- 2000-08-10 JP JP2000242906A patent/JP3521853B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101780637B (en) * | 2010-01-14 | 2012-10-24 | 重庆大学 | Method for producing large longitudinal variable cross-section steel plates |
| CN110653561A (en) * | 2018-06-28 | 2020-01-07 | 宝山钢铁股份有限公司 | Transverse and longitudinal bidirectional variable-thickness steel plate and preparation method thereof |
| CN110653561B (en) * | 2018-06-28 | 2021-10-19 | 宝山钢铁股份有限公司 | Transverse and longitudinal bidirectional variable-thickness steel plate and preparation method thereof |
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